### Home > CAAC > Chapter 1 > Lesson 1.1.4 > Problem 1-39

1-39.

Area is the total square units of a shape.

Area of a rectangle is base multiplied by height.

Base = 15 Height = 18

15(18) = 270

Reminder! Don't forget your units. ft ( ft ) = ft^{2}

270 ft^{2}

Follow the steps in part (a).

644 ft^{2}

Find both and subtract the smaller area from the larger area.